Power-operating mechanism for typewriters



0. M. HUWMNSON POWER OPERATING MECHANiSM FOR TYPEWRITERS Filed April 28, 1924 lltl iii

ll atented eto E, lhddu attain tl'llTtIl it, HUKANSON, UTE W001D$TOCK, ILLINOIS, .hSfiTGNUE "WOQDSTUCM TYPE- 'WRTTIER GOlJlElPAN'lZ', 0T WUUJUSTOCK. ILLINOIS, fit GORJPURATIQN Uh TLLTNQTE.

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application tiled n rn ca, real. Serial .tto. roaaaa.

This invention relates to a power drive tor typewriting machines, and has for its object the provision of such a device, which shall be oil improved construction and operation and which shall provide positive means for connecting the typewriter mechanism with the source ot power. The invention is enemplilied in the combination and arrangement of parts shown in the accompanying drawing and described in the following specifi cation, and it is more particularly pointed out in the appended claims.

lln the drawing: The figure is a somewhat diagrammatic vertical section through a typewriting machine showing one embodiment ot the present invention applied thereto.

AS illustrated, the numeral l0 designates the base frame of a typewriting machine having type bar 11 pivoted at 12 thereon, in a well known manner, such as that employed in the Woodstock typewriter. A plurality of key levers T3, are provided, each having a downwardly extending contact member 14-. A toothed cylinder 15. having its gear teeth 16 entending longitudinally thereot, is journaled in the side plates of the frame to, and is continuously rotated by any suitable source oil power, such as an electric motor, not shown. it shaft 17 is also journaled in the machine frame and extends parallel with the gear cylinder 15. The shatt 17 carries a plurality ot mutilated gears or discs 18, spaced along its length in position to mesh with the teeth on the cylinder 15. Each gear 18 carries a. pair oil rollers 19 and 20, projecting trom its lateral lace. A second shalt 21 is arranged parallel with the shalt l7 and carries a plurality ot escapement dogs 22, each having an abutment 23 in position to intercept the rollers on the mutilated gears, At the side oil each dog 22 is a spring lover or dog 24L con? nected with an entension 25 on the dog 22., by means out a spring 26. The long arm oil the lever or dog 24 is urged against the roller 19 tending to rotate the gear T8 in the direction of the arrow. Rotation is normally prevented by the stop 23 on the escapement dog 22. ll plunger 2? is pivoted at 28 to each oil the escapement dogs 22 and has a contact member 29 in the path oil the projection 1t on the key-lever 13. When the key lever is depressed, the stop 23 is moved out of the path oil the roller 20, and the spring lever ht ro tates the gear 18 until its teeth mesh with the teeth on the roller 15. Depression of the key lever brings the lower hooked end 80 of the escapcment dog 22 into the path of the roller 20, so that alter the teeth of the gear 18 have passed out of mesh with the roller 15, the gear will be arrested by the hook 30,

engaging the roller 20. When the key lever is released, the roller 20 will be further moved by the spring lever 2% until the roller 19 is stopped by the abutment 23. An extension plate or projection 31 is provided on the lever or dog 2ft to prevent the nose of the hook 30 from. catching on the lower edge oil the lever 24. I

Each time the gear 18 is thus given a halt revolution one of the rollers 19 and 20 strikes a cam surface 32, on an actuating lever 33, which is pivoted at 34 on a cross bar 85, carried by the frame 10. ll. spring 36 normally holds the actuating lever 33 in its uppermost position. The actuating lever 33 is pivoted at its rear end to the sub-lever ll by means of a pivot 37 and slot 38. The sub-levers ll actuate the type bars whenever the actuating lever 33 is moved downward. This occurs each time one oil the rollers 19 or 20 is moved in contact with the cam surface 32. The shalt 17 and the roller l5 may have their ares spaced a tired dis tance from one another, and it is not necessary to have them resiliently supported to permit relative movement, as is the case where frictional engagement between the parts is employed. It will be seen that a positive drive is provided -for the type bars and the various actuating units are selectively controlled by slight depressions oi the key levers l3.

ll claim? l. in a typewriting machine, a type b'ar actuating member, a toothed gear arranged to engage said member to impart movement thereto a continuously rotating powerdriven toothed gear, and .keycontrolled means tor operatively connecting said gears to operate said type-bar actuating member said gears having relatively tired axes of retation.

2. In a typewriting machine, a type bar actuating member, a drive gear, a toothed gear normally out of mesh with sa d drive g a nd a l r lever t p s the till tilt

rill

till

till

are

lltld toothed gear to engage the drive gear and operate the type bar actuating member, said toothed gear having a fixed axis of rotation and one of said gears having a portion of first-named member when said second memher is in one angular position of rotation about the axis thereof, a pair of control dogs for said second rotatable member, and a common spring exerting force on one of said dogs tending to rotate said second rotatable memher, and also yieldlngly holding the other of said dogs in position to prevent rotation 01" said second'rotatable member. 4

5. In a typewriting machine, a powerdriven member, a pair of dogs arranged ad- .jaoent one another for controlling the movement of said member, and a projection on one of said dogs overlapping the other to prevent interference between said dogs.

6. In a typewriting machine, a powerdriven member, a pair of dogs arranged adj acent one another for controlling said member, a projection on one of said dogs overlapping the other to prevent interference between said dogs, and a common spring for holding said dog in operative relation with said power-driven member.

7. In a typewriting machine, a power? I driven member, a dog tending to rotate said member, a second dog arranged to hold said member against rotation, said dogs having a common pivotal axis, a type bar actuating member arranged to be operated by sai power-driven member when rotated, and a keylever for rotating said second dog about said axis for releasing said second dog to permit rotation of said member.

8. In a typewriting machine, a mutilated toothed gear having a fixed axis of rotation, a power-driven toothed gear for operating said mutilated gear, a dog tending to rotate said mutilated gear into operative relation with said power-driven gear, a second dog for holding said mutilated gear against rotation, a key lever for releasing said second dog y to permit rotation of said mutilated gear by said first dog into operative engagement with said power-driven gear, and a type-bar actuating member arranged to be operated by said mutilated gear when rotated by said powerdriven. gear.

9. In a typewriter, a power driven rotary toothed member, a second toothed member arranged to mesh with the teeth of said first toothed member, key controlled mechanism for efiecting engagement between said toothed members, and second-rained toothed memher having a fixed axis of rotation, an operat ing member for said typewriter having a cam surface thereon, and means on said secondnamed toothed member for engaging said cam surface to actuate said operating member.

10. In a typewriter, a type bar, an operating member for said type ar having a cam surface thereon, a rotary. disc having a fixed axis of rotation, means on said rotary disc for engaging said cam surface to actuate said operating member, teeth formed on a portion only of the periphery of said rotary disc, 8. power driven member having teeth thereon for engaging the teeth of said rotary disc, and key controlled means for effecting engagement between the teeth of said rotary disc and said power driven member.

In testimony whereof I have signed my name to the specification on this 24th day of April, A. D. 1924.

I OTTO A. HOKANSON. 

